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POLibGdx How to Scroll using OrthographicCamera?
 

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  1. POLibGdx How to Scroll using OrthographicCamera?
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    <p><img src="https://i.stack.imgur.com/Jiafh.png" alt="enter image description here"></p> <p>I have been loocking for 10 hours (literally) and I'm done, I need to ask. Thing is I'm learning How use LibGdx to program Java games. I'm doing a Horizontal Space Ship Game. So, my worst problem here is that I do not know how do scroll (I think draw will explain better). I want to draw a hudge background (Space) and make my OrthographicCamera move right like with my SpaceShip, so it will create a Scroll effect with the Space Background. No enemys and nothing but the ship on the screen.</p> <p>I'm triying this </p> <pre><code> public void moveCamera(float x,float y){ cam.position.set(x, y, 0); } </code></pre> <p>Then I use that method in my WorldRender render() method:</p> <pre><code>public void render(float delta){ ship.Move(delta); moveCamera(ship.getPosition().x,ship.getPosition().y); cam.update(); System.out.println(""+cam.position); spriteBatch.begin(); drawBackground(); drawShip(); spriteBatch.end(); } </code></pre> <p>I actually move the camera position (I can see that thanks to the println), but It isn't moving in the game, so SpaceShip just dissapears by the edge of the window. </p> <p>I also tried this before spriteBatch.end()</p> <pre><code>spriteBatch.setProjectionMatrix(camera.combined); </code></pre> <p>but when I do that windows oly shows a black screen, no ship, no nothing. As I said, I'm desperate, I see lot of examples (scroll with mouse, paralexscrolling etc) but all are to advanced or just nothing to do with my code. Any help wil be appreciated</p> <p>This is how I draw stuff. Background and ship are textures inside WorldRender. I draw background image very wide, so my intention is do some scrolling over as I said. That's the code </p> <pre><code>private void loadTextures(){ shipTexture=new Texture(Gdx.files.internal("nave.png")); background=new Texture(Gdx.files.internal("fondo.jpg")); } public void drawShip(){ spriteBatch.draw(shipTexture,ship.getPosition().x*ppuX,ship.getPosition().y*ppuY, ship.WIDTH*ppuX,ship.HEIGHT*ppuY); } public void drawBackground(){ spriteBatch.draw(background, -10*ppuX,0*ppuY, Gdx.graphics.getWidth()*10,Gdx.graphics.getHeight()); } </code></pre> <p>Here you can download the code if someone want to help in hardcore mode</p> <p><a href="http://ubuntuone.com/3IdlECzw1zdJnqfj7hKDd0" rel="nofollow noreferrer">My code (not working)</a> </p> <p>I FINALLY SOLVED IT!!!! WIIIIIIIIII!!! That's the code I used in a class name WorldRenderer, wich have methods that are calle within GameScreen for render, resize etc</p> <pre><code> public WorldRenderer(World world) { // TODO Auto-generated constructor stub this.world=world; this.ship=world.getShip(); this.cam = new OrthographicCamera(CAMERA_WIDTH,CAMERA_HEIGHT); this.cam.setToOrtho(false,CAMERA_WIDTH,CAMERA_HEIGHT); this.cam.position.set(ship.getPosition().x,CAMERA_HEIGHT/2,0); this.cam.update();//actualizamos la camara spriteBatch=new SpriteBatch(); loadTextures(); } private void loadTextures(){ shipTexture=new Texture(Gdx.files.internal("nave.png")); background=new Texture(Gdx.files.internal("fondo.jpg")); } public void drawShip(){ spriteBatch.draw(shipTexture,ship.getPosition().x,ship.getPosition().y,10,10); } public void drawBackground(){ spriteBatch.draw(background, 0,0, 500,50); } public void render(float delta){ ship.Move(delta); moveCamera(ship.getPosition().x); spriteBatch.setProjectionMatrix(cam.combined); spriteBatch.begin(); drawBackground(); drawShip(); spriteBatch.end(); } public void moveCemara(float x){ cam.position.set(x+20,cam.position.y, 0); cam.update(); } </code></pre> <p>Inside the Ship I have this method wich I call within render in WorldRenderer to move It</p> <pre><code>public void Move(float delta){ if(Gdx.input.isKeyPressed(Keys.LEFT)) this.position.x -=velocity *delta; if(Gdx.input.isKeyPressed(Keys.RIGHT)) this.position.x +=velocity *delta; if(Gdx.input.isKeyPressed(Keys.UP)) this.position.y +=velocity *delta; if(Gdx.input.isKeyPressed(Keys.DOWN)) this.position.y -=velocity *delta; } </code></pre> <p>Also I want to thanks very much to the people who helped me. I'm marking first answer as the good one, but, mix both was what gave me the real solution.</p> <p>I leave here some tutos I followed wich are pretty good for noobs</p> <p>Thats a good everything-from-scratching-tuto <a href="http://bitowl.de/de/adventskalender/" rel="nofollow noreferrer">LiGdxForNoobs</a></p> <p>A simple plataform game <a href="http://obviam.net/index.php/getting-started-in-android-game-development-with-libgdx-create-a-working-prototype-in-a-day-tutorial-part-1/" rel="nofollow noreferrer">platformGame</a></p> <p>A very simple game <a href="http://code.google.com/p/libgdx/wiki/SimpleApp" rel="nofollow noreferrer">bucketGame</a></p>
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